GM Service Manual Online
For 1990-2009 cars only

Climate Control System With Air Conditioning

With this system you can control the heating, cooling, and ventilation for your vehicle.


Object Number: 1822189  Size: B2

Operation

(Fan): Turn the left knob clockwise or counterclockwise to increase or decrease the fan speed. Turn the knob all the way counterclockwise to turn the front system off.

Temperature Control: Turn the center knob clockwise or counterclockwise to increase or decrease the temperature inside the vehicle.

Use the right knob to select from the following modes:

The right knob can be positioned between two modes to select a combination of those two modes.

(Vent): This mode directs air to the instrument panel outlets.

(Bi-Level): This mode directs half of the air to the instrument panel outlets and half to the floor outlets.

(Floor): This mode directs most of the air to the floor outlets with some air directed to the windshield and side window outlets. In this mode, the system will automatically select outside air. Recirculation cannot be selected in floor mode.

The right knob may also be used to select the defrost and defog mode. For more information, see "Defogging and Defrosting" later in this section.

(Outside Air):  Press this button to turn the outside air mode on. When the button is pressed, an indicator light will come on. When this mode is on, outside air will circulate throughout the vehicle. The outside air mode can be used with all modes, but it cannot be used with the recirculation mode.

(Recirculation): Press this button to turn the recirculation mode on. When the button is pressed, an indicator light will come on. This mode keeps outside air from entering the vehicle. It can be used to reduce outside air and prevent odors from entering the vehicle. Recirculation may also help cool the air inside the vehicle more quickly once the temperature inside the vehicle is less than the outside temperature. The recirculation mode cannot be used with floor, defog or defrost modes. If recirculation is selected with one of these modes, the indicator light will flash three times and then turn off. While in recirculation mode the windows may fog when the weather is cold and damp. To clear the fog, select either the defog or defrost mode and increase the fan speed. The recirculation mode can be turned off by pressing the outside air button, or by turning off the ignition.

(Air Conditioning): Press this button to turn the air conditioning system on or off. When this button is pressed, an indicator light on the button will come on to let you know the air conditioning is activated. The air conditioning can be selected in any mode as long as the fan switch is on.

The air conditioning system removes moisture from the air, so you may sometimes notice a small amount of water dripping underneath your vehicle while idling or after turning off the engine. This is normal.

Defogging and Defrosting

Fog or frost on the inside of windows is a result of high humidity (moisture) condensing on the cool window glass. This can be minimized if the climate control system is used properly. To avoid fogging windows on rainy and humid days at temperatures above freezing, run the air conditioning compressor. It is best to avoid the use of the recirculation mode, except when maximum A/C performance is needed or for short times to avoid exterior odors.

Turn the right knob to select the defog or defrost mode.

(Defog): This mode clears the windows of fog or moisture and warm the passengers. The air is directed to the windshield, floor outlets, and side window vents.

(Defrost): This mode removes fog or frost from the windshield more quickly. A portion of the air is directed to the windshield and the side window vents, with some air directed to the floor vents. The system will automatically force outside air into the vehicle.

The recirculation mode cannot be selected in the defog or defrost mode. When either mode is selected, the system runs the air conditioning compressor, unless the outside temperature is close to freezing. Do not drive the vehicle until all the windows are clear.

Rear Window Defogger

If your vehicle has a rear window defogger it uses a warming grid to remove fog from the rear window.

The rear window defogger will only work when the ignition is in RUN.

(Rear): Press this button to turn the rear window defogger on or off. An indicator light on the button will come on to let you know that the rear window defogger is activated.

The rear window defogger will only work when the ignition is in RUN. The rear window defogger will stay on for approximately 10 minutes after the button is pressed, unless the ignition is turned to ACC or LOCK. The defogger can also be turned off by pressing the button again or by turning off the engine.

Notice: Do not use anything sharp on the inside of the rear window. If you do, you could cut or damage the warming grid, and the repairs would not be covered by the vehicle warranty. Do not attach a temporary vehicle license, tape, a decal or anything similar to the defogger grid.

Climate Control System Heater Only

With this system you can control the heating and ventilation for your vehicle.


Object Number: 1835503  Size: B2

Operation

(Fan): Turn the left knob clockwise or counterclockwise to increase or decrease the fan speed. Turn the knob all the way counterclockwise to turn the front system off.

Temperature Control: Turn the center knob clockwise or counterclockwise to increase or decrease the temperature inside the vehicle.

Use the right knob to select from the following modes:

The right knob can be positioned between two modes to select a combination of those two modes.

(Vent): This mode directs air to the instrument panel outlets.

(Bi-Level): This mode directs half of the air to the instrument panel outlets and to the floor outlets.

(Floor): This mode directs most of the air to the floor outlets with some air directed to the windshield, side window outlets, and second row floor outlets. In this mode, the system will automatically select outside air.

Defogging and Defrosting

Fog or frost on the inside of windows is a result of high humidity (moisture) condensing on the cool window glass. This can be minimized if the climate control system is used properly.

Turn the right knob to select the defog or defrost mode.

(Defog): This mode clears the windows of fog or moisture and warm the passengers. The air is directed to the windshield, floor outlets, and side window vents.

(Defrost): This mode removes fog or frost from the windshield more quickly. A portion of the air is directed to the windshield and the side window vents, with some air directed to the floor vents. The system will automatically force outside air into the vehicle.

Do not drive the vehicle until all the windows are clear.